Study on Rebound Values on Inclined Planes

Abstract

Non-Destructive Testing (NDT) methods are widely used in the industry to assess the parameters like strength and durability of an existing structure. They offer significant advantages of speed, cost and lack of damage in comparison with test methods which require the removal of a sample. But they incorporate various limitations in practical use. This study is focused on the ‘Rebound Hammer Test’ which is used to assess the compressive strength by surface hardness. The rebound hammer concernedin this case, has been calibrated and charts have been developed to get the readings on vertical and horizontal surfaces only. When the structure to be investigated is consisted of an inclined surface, direct use of these charts may not be possible. During this study, basic formulation to calculate the corresponding horizontal rebound number to represent a rebound value obtained on an inclined plane was derived and verified. Taking readings on inclined surfaces of the cubes placed at different angles was done in order to observe the deviations and then the results were interpreted and analysed to obtain a suitable relationship by applying the derived formula.